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Venkatesan, T. R.
- 40Ar-39Ar Darting of Deccan Basalts
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Authors
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
1 Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 1 (1986), Pagination: 102-109Abstract
The feasibility of dating igneous rocks by the 40Ar-39Ar method in India using the Apsara nuclear reactor at BARC, Bombay is reported, based on measurements on two tholeiitic basalts and one alkali basalt associated with the Deccan volcanism. The ages of the tholeiitic basalts are 71±4 Ma and 65±4 Ma, respectively and that of the alkali basalt is 682 Ma. Apart from the low neutron flux requiring long irradiation times, the neutron fluence within the sample irradiation volume is somewhat anisotropic. The latter needs to be minimised to achieve the higher precision the method is capable of.
- Consideration of Analytical Uncertainties While Plotting Histograms
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Authors
Affiliations
1 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
1 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 41, No 4 (1993), Pagination: 313-317Abstract
A procedure is outlined for plotting histograms taking the experimental errors into consideration. This is illustrated with an example. The Fortran program is also given.Keywords
Histograms, Analytical Uncertainties.- Mundwara Alkali Igneous Complex, Rajasthan, India: Chronology and Sr Isotope Systematics
Abstract Views :244 |
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Authors
Affiliations
1 Geochemistry Division, KDMIPE, ONGC, Dehradun-248 195, IN
2 Physical Research Laboratory, Ahmedabad - 380 009, IN
3 Geology Department, M.L. Sukhadia University, Udaipur - 313 001, IN
1 Geochemistry Division, KDMIPE, ONGC, Dehradun-248 195, IN
2 Physical Research Laboratory, Ahmedabad - 380 009, IN
3 Geology Department, M.L. Sukhadia University, Udaipur - 313 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 5 (1996), Pagination: 517-528Abstract
Six whole rock samples have been dated by 40Ar/39Ar method to ascertain the emplacement time of the Mundwara Alkali Igneous Complex, Rajasthan, India. The dated samples include four from the Musala hill and one each from Mer and Toa hills of the complex. Out of these, only two syenite samples. viz. MR 86/4 and MR 86/7 from the Musala and Mer hills, respectively, have given plateaus at 64 Ma, while the remaining samples have exhibited saddle shaped spectra owing to the presence of excess argon. However, similar isochron ages of about 70 Ma obtained from a basalt (Musala hill) and a gabbro (Toa hill) by linear regression of all the data points might suggest initiation of igneolls activity at Mundwara around 70 Ma ago.87Sr/86Sr ratios of this suite range from 0.70385 to 0.70551 indicating its derivation from a mantle source.